I use Solwise 500 Homeplugs with pass-through so you can still use the plug socket. They work fine and I've never had a problem but in the case of homeplugs, you need to make sure you are on the same electrical circuit for your house, so older properties can be a problem.
The version I have only cost £18.11 now, see link below. Think I will buy a few more.
http://www.solwise.co.uk/net-powerline-500av-index.htm